Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Biodegradable bursting release system










Image Number 4 for United States Patent #5429822.

A biodegradable polymeric multiphasic release system of one or more biodegradable bursting units capable of delivering biologically active substances in a burst or pulse at predetermined times and a method for constructing those units is disclosed. The individual bursting units of the system may take the form of a biodegradable, membrane coated capsule surrounding a core material which may include an active agent. The membrane ruptures after a predetermined time upon exposure to water or bodily, or other aqueous environmental fluids. The bursting units may be used in any situation in which a controlled pulsed release of an active substance is desired. The predetermined time release of each bursting unit is controlled by the composition of the core material, the initial radius and wall thickness of the membrane and the porosity of the membrane. The core material may also contain a chemical composition which generates gas as fluid is drawn into the bursting unit thus adding an additional design variable for predetermining bursts.








 
 
  Recently Added Patents
Devices and methods for the production of coaxial microfibers and nanofibers
Voltage detector having voltage detection printed board
Sweetener compositions having enhanced sweetness and improved temporal and/or flavor profiles
Efficient relay automatic repeat request procedure in broadband wireless access system
Compositions of PD-1 antagonists and methods of use
Near-field optical disk having surface plasmon amplification by stimulated emission of radiation
Cooking brush
  Randomly Featured Patents
Collection electrode (collectrode) for geo-electrochemical sampling
Device and method for trans myocardial revascularization (TMR)
Multi-threshold reliability decoding of low-density parity check codes
Method of making an interposer sub-assembly in a printed wiring board
Dental prophylaxis angle
Controlling device with selectively illuminated user interfaces
Recreational vehicle having slide-out atrium room
Coolable airfoil attachment section
Data storage disc holder having central shaft held by spring loaded clamps against inclined surfaces when in disc gripping configuration
Bingo accessory carrying case